The fiber-compatible extenders can be used with multimode or single-mode fiber optic cable. Maximum distance over multimode fiber is 3281 feet (1000 m). Maximum distance over single-mode fiber is 6 miles (10 km). Also available in models compatible with CATx cable. Compact housing enables high-density mounting within 19" racks (up to four devices in 1U). Chassis range in size from 2, 4, 6, or 21 ports, to 48, 80, 160, and 288 ports.The compact extenders also work as standalone, point-to-point KVM extenders.